What's in a tag name? JavaScript, apparently

By PortSwigger Research1 min readPublished 25 August 2026

https://portswigger.net/research/whats-in-a-tag-name-javascript-apparently

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I was on my laptop, as I often am when there's rubbish on telly, and found myself wondering what characters are allowed in a tag. I knew they had to begin with "a-zA-Z", but what about after that? I t...

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